They exert punctual stimuli on the muscles and plantar tendons. For improved stability in the feet, stretching the arches and treating a variety of common foot ailments, including plantar fasciitis and heel spur syndrome. Made of wood. LxH: 14x5 cm. Max. load: 120 kg. 0.7 kg. Incl. slip-resistant mat (diameter 25 cm), Oeko-Tex Standard 100 and cotton storage bag.